Spin Evolution Of X-ray Pulsars

In this paper, I report the work on the spin evolution and interaction between the disk and the neutron stars in X-ray binaries. AS the particular spin transition of4U1626-67and the extraordinary large spin period of AX J1841.0-0536, we focused my study on these two sources.In the first two chapters, I narrate the main observation features and basic expla-nations of X-ray binaries. The first chapter states the mechanism of X-ray in X-ray binaries, accretion, Roche lobe, the formation of the disk, stability, ADAF, the interac-tion between the disk and the NS, which mainly refer to the low-mass X-ray binaries. While the other chapter shows three distinct types of high-mass X-ray binaries, espe-cially on the new discovered SFXTs.As the continuous spin trend accompanied with sudden spin transition, the source4U1626-67captured our attention. In Chapter Three, we analyzed the spin trend and the current disk models, but once put QPO variation into consideration, conflictions appeared. To solve the problem, we prompted a new model which assumed the co-existence of the wind and the disk. Some evidences from observation also would be interpreted.In Chapter Four, we confined the parameters of AX J1841.0-0536, a supergiant fast X-ray transient. Based on the evolution theory of Davies&Pringle(1981), the magnetic field is deduced less than1011G, much smaller than the typical value1012G. Then we demonstrate its being of an anti-magnetar.Finally, the last chapter exhibits a brief summary.